Quick update. Four of the wheels came off damage free and fairly easily. One is still on and is intact, for now at least. One is destroyed and so is its tire. The destroyed one had a portion of the inner lip rusted completely through so I figured it needed replacing anyway. I ruined the tire trying to break the bead off the rim. On a weird note, the two stuck rims are mounted over some sort of aluminum spacer. The ones that came off were not. I guess the different metals in contact with each other are part of the reason they are being especially difficult. I tried different pullers I have here and couldn't really get any to work. My problem is the only place I can find to pull is on the inside of the hub opening and the lip I have to hang the puller edges on is too small and easily bent. With the wheels off I can see that at least some of my flanges look ruined. The axle is just flopping around on at least two holes. The shopping list grows...wheels, tires, chain, flanges, bearings...